ESB-2019.1206 - [Appliance] Siemens SIMOCODE pro V EIP: Denial of service - Remote/unauthenticated 2019-04-10

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.1206
                        Siemens SIMOCODE pro V EIP
                               10 April 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Siemens SIMOCODE pro V EIP
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-12741  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-19-099-01

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Advisory (ICSA-19-099-01)

Siemens SIMOCODE pro V EIP

Original release date: April 09, 2019

Legal Notice

All information products included in http://ics-cert.us-cert.gov are
provided"as is" for informational purposes only. The Department of Homeland
Security (DHS) does not provide any warranties of any kind regarding any
information contained within. DHS does not endorse any commercial product or
service, referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the header.
For more information about TLP, see http://www.us-cert.gov/tlp/ .

1. EXECUTIVE SUMMARY

  o CVSS v3 7.5
  o ATTENTION: Exploitable remotely/low skill level to exploit
  o Vendor: Siemens
  o Equipment: SIMOCODE pro V EIP
  o Vulnerability : Uncontrolled Resource Consumption

2. RISK EVALUATION

Successful exploitation of this vulnerability could cause a denial-of-service
condition.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of SIMOCODE pro V EIP, a motor management system for
low-voltage motors, are affected:

  o SIMOCODE pro V EIP all versions prior to v1.0.2

3.2 VULNERABILITY OVERVIEW

3.2.1 UNCONTROLLED RESOURCE CONSUMPTION CWE-400

Specially crafted packets sent to Port 161/UDP could cause a denial-of-service
condition. The affected devices must be restarted manually.

CVE-2017-12741 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:N/I:N/A:H ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy,
    Food and Agriculture, Water and Wastewater Systems
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Siemens ProductCERT reported this vulnerability to NCCIC.

4. MITIGATIONS

Siemens recommends users upgrade to Version 1.0.2. Users who cannot upgrade
because of hardware restrictions are recommended to apply the manual
mitigations. Updates are available for download from the following link:

https://support.industry.siemens.com/cs/ww/en/view/109756912

Siemens also recommends users apply the following manual mitigations:

  o Protect network access to Port 161/UDP of affected devices.
  o Apply cell protection concept and implement defense-in-depth.
  o Use VPN for protecting network communication between cells.

As a general security measure, Siemens strongly recommends protecting network
access to devices with appropriate mechanisms. In order to operate the devices
in a protected IT environment, Siemens recommends configuring the environment
according to Siemens' operational guidelines for Industrial Security ( Download
) and following the recommendations in the product manuals.

Additional information on industrial security for Siemens devices can be found
at:

https://www.siemens.com/industrialsecurity

For more information on this vulnerability and more detailed mitigation
instructions, please see Siemens Security Advisory SSA-141614 at the following
location:

http://www.siemens.com/cert/advisories

NCCIC recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:

  o Minimize network exposure for all control system devices and/or systems,
    and ensure that they are not accessible from the Internet .
  o Locate control system networks and remote devices behind firewalls, and
    isolate them from the business network.
  o When remote access is required, use secure methods, such as Virtual Private
    Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
    be updated to the most current version available. Also recognize that VPN
    is only as secure as the connected devices.

NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

NCCIC also provides a section for control systems security recommended
practices on the ICS-CERT web page. Several recommended practices are available
for reading and download, including Improving Industrial Control Systems
Cybersecurity with Defense-in-Depth Strategies .

Additional mitigation guidance and recommended practices are publicly available
on the ICS-CERT website in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .

Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to NCCIC for tracking
and correlation against other incidents.

No known public exploits specifically target this vulnerability.

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